That's not really a sustainable example either. In wartime, the British rationing board ensured that the British Restaurants were well-supplied (they wouldn't h

That's not really a sustainable example either. In wartime, the British rationing board ensured that the British Restaurants were well-supplied (they wouldn't have been in a free market, or they would've been more expensive) and after the war, the ones that survived were propped up by Labor governments. That the kitchens were run not-for-profit says absolutely nothing about whether those prices were actually sustainable for the food they were serving - if supplies are subsidized then NFP just means not taking in more than expended in subsidies. If anybody has details of how they were funded in the post-war period, I'd be happy to consider it.